3) K. Koshikawa: A Polarimetric Approach to Shape Understanding of Glossy Objects, Proc. 6th Int. Joint Conf. Artificial Intell., 493/495 (1979)
4) K. Ikeuchi: Determining Surface Orientations of Specular Surfaces by Using the Photometric Stereo, IEEE Trans. Pattern Analysis and Machine Intelligence, PAMI-3-6, 661/669 (1981)
5) A.C. Sanderson, L.E. Weiss and S.K. Nayar: Structured Highlight Inspection of Specular Surfaces, IEEE Trans., PAMI-10-1, 44/55 (1988)